it was britain's worst peacetime act of terrorism. but now, there are concerns that families of those killed on 7/7, in 2005, were also eavesdropped upon by the british tabloid, "news of the world." graham lost his son, david, in the attack. and says his phone may have been hacked by reporters. >> the thought that somebody may have been listening to me begging for david to phone home. i thought we were in a dark place and i didn't think anybody could make it darker. but i'm proved wrong. >> reporter: the phone hacking scandal is so shocking, it's prompted an emergency debate in britain's parliament. >> it's make the public. and i feel so appalled by what's happened. murder victims, terrorist victims, who had their phones hacked. that's why there's a full police investigation, with all of the powers they need. we have the inquiries to get to the bottom of what went wrong. >> reporter: it's put former "news of the world" editor, rebecca brooks under incredible pressure. he's now chief executive of the parent company, news international.